ktard, k-tard (n):
Someone who regularly consumes mass amounts of ketamine to the point that they become permanently retarded. Ktards are known for being blissfully unaware of their surroundings and life in general. The only care about k and will stop at nothing to get their fix.

You can tell if someone is ktarded (high on k) by their blank stare, open mouth (tongue occasionally hanging out) and inability to walk, talk, move, comprehend, or do anything other than listen to drum & bass for hours straight.

People who do lines of k in the bathroom of malls, then walk around really fucked up screaming at people and talking to strangers and making obscene gestures. These people also go to raves, fucked up on k, staring at visualizations, thinking they're on the moon, because they can't walk from all the k. Soon, they think they are gods or Al Pacino, and will start talking in a thick cuban accent telling everyone that they're going to get shit on.

Yo, I snorted what I thought was K but it was just DXM so I had to puke, then we went to this party in Pickering and did more K and then we got kicked out so we went to Mad Bar and did some K and we got kicked out so we went to the mall and we got massages on the 2 dollar chairs. Then we got kicked out.